Yeah. I was going to do it on my day off, when I could take them out of my room. ^_^Don't forget to pick a paint with no fumes and would be safe if they some how are able to chew on that part of the wood.
Yeah, I was thinking about putting a tube around the top!It has a lot of space up at the top... I think tat your rats would love to have some hammocks and tubes and branches. That extension is amazingly super awesome- its like ratty heaven!